Took mine to Melbourne with Emirates a few months ago.
First thing, dont forget you can take 7kg in hand luggage, most of my clothes went in there, I took a 35ltr osprey rucksack which was around the max size and weighed f all.
Mine made it there fine, but make sure you pack it well and put spacers in your forks and rear drop outs (my forks had a 20mm axle which I forgot to tighten and they got a bit squashed but sprung back ok). I cut a piece of 15mm plastic pipe the width of a rear hub and put it in the frame on the QR to brace the rear.
Strangely, after a whole afternoon of paranoid cleaning, including removing the cleats from my shoes (amazing how much sheep poo can fit under them), I got to customs and they only asked to see the tyres. I bought new ones to take with me so they were spotless and they just waved me through. Think I may be the exception to the rule as I’ve heard some other stories of people having to pay $$$ for a clean or face having their bike confiscated.
Didn’t bother cleaning any more than hosing it down when returning to UK, nobody asked to see anything when I got back.